A rough-order-of-magnitude (ROM) estimate for replacing 100% of US electricity generation with solar canopies over parking lots, paired with distributed iron-air battery storage.
- Cover 4.4 million grocery-store-sized parking lots with solar canopies
- Pair each lot with iron-air battery storage (3–4 shipping containers per lot)
- Replace 100% of US electricity generation
- Build it in 7 years
| Metric | Value |
|---|---|
| Annual consumption | ~4,000 TWh |
| Average continuous demand | ~450–500 GW |
| Peak demand (summer) | ~700–750 GW |
Each grocery-store-sized parking lot (~1.5 acres, ~150–200 spaces) becomes a self-contained solar microgrid node.
| Component | Per Lot |
|---|---|
| Solar canopy nameplate capacity | ~0.45 MW |
| Daily generation (25% capacity factor) | ~2.7 MWh |
| Iron-air battery storage | ~2.3 MWh |
| Battery footprint | 3–4 shipping containers |
| Ground space used by batteries | ~2% of lot |
Costs reflect learning-curve reductions as production scales (~20–25% cost drop per cumulative doubling).
| Component | Cost |
|---|---|
| Solar canopies (2,000 GW) | $3.4T |
| Iron-air batteries (10,000 GWh daily) | $550B |
| Seasonal storage supplement (50,000 GWh) | $300B |
| Power electronics / inverters | $350B |
| Distribution grid upgrades (4.4M lots) | $350B |
| Transmission upgrades (HVDC corridors) | $300B |
| Grid modernization (controls, software, cyber) | $75B |
| Engineering & program management | $400B |
| Contingency (12%) | $700B |
| TOTAL | $6.4T |
Annual spend during build: ~$915B/yr
| Year | Cumulative Build | Solar $/W | Iron-Air $/kWh | Annual Lots Built |
|---|---|---|---|---|
| 1–2 | Ramp-up | $2.50 | $35 | ~200K/yr |
| 3–4 | ~15% complete | $2.10 | $28 | ~350K/yr |
| 5–6 | ~35% complete | $1.75 | $22 | ~450K/yr |
| 7 | ~60–100% complete | $1.30–1.50 | $15–18 | ~500K/yr |
Without learning curves the program would cost ~$10.5T. Production efficiencies save ~$4T.
| Item | Annual Cost |
|---|---|
| Grid maintenance (existing + new) | $125B |
| Solar canopy maintenance & cleaning | $30B |
| Iron-air battery maintenance | $20B |
| Battery replacement reserve (20-yr cycle) | $40B |
| Grid operations, software & staffing | $25B |
| TOTAL | $240B/yr |
| Metric | Today | After Build |
|---|---|---|
| Annual electricity cost | $450B/yr | $240B/yr |
| Annual fuel cost | $200B/yr | $0 |
| CO₂ from electricity | 1.6B tons/yr | 0 |
| Energy price volatility | High | Near zero |
| Annual savings | — | $210B/yr |
| Metric | Value |
|---|---|
| Total parking lots covered | 4.4 million |
| Total build cost | $6.4 trillion |
| Build timeline | 7 years |
| Annual build spend | ~$915B/yr |
| Post-build annual energy budget | $240B/yr |
| Annual savings vs. today | $210B/yr |
| Cost per US household | ~$49K |
| Breakeven | ~16–17 years post-build |
| 50-year net savings (after payback) | $5–6 trillion |
Per capita cost: $19,137 · Per household: ~$47,843
| State | Est. Population | State Share | Per Capita |
|---|---|---|---|
| California | 39,500,000 | $755.9B | $19,137 |
| Texas | 30,500,000 | $583.7B | $19,137 |
| Florida | 23,000,000 | $440.2B | $19,137 |
| New York | 19,500,000 | $373.2B | $19,137 |
| Pennsylvania | 12,800,000 | $245.0B | $19,137 |
| Illinois | 12,500,000 | $239.2B | $19,137 |
| Ohio | 11,800,000 | $225.8B | $19,137 |
| Georgia | 11,000,000 | $210.5B | $19,137 |
| North Carolina | 10,700,000 | $204.8B | $19,137 |
| Michigan | 10,000,000 | $191.4B | $19,137 |
| New Jersey | 9,300,000 | $178.0B | $19,137 |
| Virginia | 8,700,000 | $166.5B | $19,137 |
| Washington | 7,900,000 | $151.2B | $19,137 |
| Arizona | 7,400,000 | $141.6B | $19,137 |
| Tennessee | 7,100,000 | $135.9B | $19,137 |
| Massachusetts | 7,000,000 | $134.0B | $19,137 |
| Indiana | 6,800,000 | $130.1B | $19,137 |
| Missouri | 6,200,000 | $118.6B | $19,137 |
| Maryland | 6,200,000 | $118.6B | $19,137 |
| Wisconsin | 5,900,000 | $112.9B | $19,137 |
| Colorado | 5,900,000 | $112.9B | $19,137 |
| Minnesota | 5,700,000 | $109.1B | $19,137 |
| South Carolina | 5,400,000 | $103.3B | $19,137 |
| Alabama | 5,100,000 | $97.6B | $19,137 |
| Louisiana | 4,600,000 | $88.0B | $19,137 |
| Kentucky | 4,500,000 | $86.1B | $19,137 |
| Oregon | 4,300,000 | $82.3B | $19,137 |
| Oklahoma | 4,000,000 | $76.5B | $19,137 |
| Connecticut | 3,600,000 | $68.9B | $19,137 |
| Utah | 3,400,000 | $65.1B | $19,137 |
| Iowa | 3,200,000 | $61.2B | $19,137 |
| Nevada | 3,200,000 | $61.2B | $19,137 |
| Arkansas | 3,000,000 | $57.4B | $19,137 |
| Mississippi | 2,900,000 | $55.5B | $19,137 |
| Kansas | 2,900,000 | $55.5B | $19,137 |
| New Mexico | 2,100,000 | $40.2B | $19,137 |
| Nebraska | 2,000,000 | $38.3B | $19,137 |
| Idaho | 2,000,000 | $38.3B | $19,137 |
| West Virginia | 1,800,000 | $34.4B | $19,137 |
| Hawaii | 1,400,000 | $26.8B | $19,137 |
| New Hampshire | 1,400,000 | $26.8B | $19,137 |
| Maine | 1,400,000 | $26.8B | $19,137 |
| Montana | 1,100,000 | $21.1B | $19,137 |
| Rhode Island | 1,100,000 | $21.1B | $19,137 |
| Delaware | 1,000,000 | $19.1B | $19,137 |
| South Dakota | 900,000 | $17.2B | $19,137 |
| North Dakota | 800,000 | $15.3B | $19,137 |
| Alaska | 700,000 | $13.4B | $19,137 |
| Vermont | 650,000 | $12.4B | $19,137 |
| Wyoming | 580,000 | $11.1B | $19,137 |
| TOTAL | 334,430,000 | $6.4T | $19,137 |
Note: A pure population split is the simplest model. A more nuanced version could weight by state electricity consumption, solar resource quality, and existing grid infrastructure.
Covering only 70% of US demand is arguably the sweet spot — skip the hardest, least-sunny sites and let existing gas, nuclear, hydro, and wind handle the rest.
| Metric | 100% Plan | 70% Plan |
|---|---|---|
| Lots covered | 4.4M | 3.1M |
| Total build cost | $6.4T | $3.8T |
| Build timeline | 7 years | 7 years |
| Annual build spend | ~$915B/yr | ~$540B/yr |
| Post-build annual cost | $240B/yr | $110–125B/yr |
| Breakeven | ~16–17 yrs | ~12–14 yrs |
| Factor | Lithium-Ion (LFP) | Iron-Air |
|---|---|---|
| Energy density | ~200 Wh/kg | ~50 Wh/kg |
| Cost per kWh | $150–200 | $20–50 |
| Round-trip efficiency | ~90% | ~45–50% |
| Cycle life | 4,000–6,000 | 3,000+ |
| Lifespan | 10–15 years | 20+ years |
| Material scarcity | Constrained (lithium) | Abundant (iron) |
| Best for | Daily cycling | Multi-day / seasonal |
This plan uses iron-air for its low cost and material abundance, accepting the lower efficiency tradeoff.
The US has paved enough parking to power itself with solar. $6.4T over 7 years. Energy bill drops from $450B to $240B/yr. Pays for itself, then saves $210B/yr forever. And you never park in the sun again. ☀️
All figures are rough-order-of-magnitude estimates based on publicly available data and standard industry assumptions. Actual costs would vary based on regional factors, policy, supply chain conditions, and technology development.